🎉 Free launch period — every calculator, every feature unlocked, no account needed, through mid-November 2026. PDF reports carry a watermark for everyone during this period.

Resources

Everything on AJapps that teaches rather than calculates — conceptual guides for each category, and step-by-step worked examples for individual problems.

Not sure which to start with? A Guide is the right place to start if you're new to a category and want the underlying theory before touching a calculator. A Worked Example is the right place to start if you already know roughly what you're doing and want to see one specific problem solved end to end.